A way in which your game character interacts with the rest of the game world. Most of the time the game's normal mechanic is in effect, but there are buffs and debuffs that can change your mechanic. Debuffs that impose mechanic-altering effects come in all dispel types, and some have no dispel type at all, meaning that they either must run their course and expire over time or have a specific way in which they can be removed.

If one attains the second PvPrank (Corporal/Grunt) in the Honor System (pre-2.0), one can purchase an "Insignia of the Alliance/Horde" trinket, which when activated can remove three class-dependent types of mechanics; this power has a cooldown of 5 minutes. This table shows which class's "Insignia of the Alliance/Horde" trinket removes which effects. A "Y" means the class's trinket can remove the listed type of effect, while an "N" means it can't.

You can't control your character, who stands still, usually with hearts floating above his/her head. Some classes' PvP trinkets cancel this effect, as does the Undead racial ability Will of the Forsaken.

You can't control your character, who wanders aimlessly. There may be items that help remove this effect (if this happens as part of a Polymorph, see Polymorph for more), and these would of course be usable in this situation.

The damage dealt by every melee attack you make is reduced. There is to my knowledge no way to remove this mechanic specifically, although the debuff that causes it is usually either a Curse or a Magic-type debuff, which can be removed in the usual way.

You move slowly. This is a lot like the Snare mechanic, although it has the added effect of knocking you off your mount, if you're on one to begin with. These effects are usually very short-duration. A Blizzard post to the official forums indicated that it is intentionally impossible to remove a Daze other than by waiting it out. There was once a bug (appeared in patch 1.6; fixed in patch 1.7) that allowed Paladins' Blessing of Freedom and Druids' Shapeshifting to remove Daze, but this was a mistake.

You cannot move and cannot use abilities, however the effect is broken when you take damage.

There is some debate over whether the expansion cat Druid ability Maim is an incapacitate debuff. It does break when the afflicted takes damage, but not when they take damage from periodic damage (such as damage from rake or rip). Currently, incapacitates do break when hit by damage from DoTs.

You continue to take damage every few seconds for the duration of the effect. The amount of damage depends on the effect, as does how often the damage occurs. There are items (such as the mighty Luffa) that remove physical Periodic Damage mechanics, which are known as Bleed effects.

This is basically a combination of a Confuse effect and a Transform effect. The reason why it's a separate mechanic from those other two is that there are items (for example, the PvP trinkets) and class abilities (such as the Druid ability to shapeshift) that remove both components of a Polymorph effect.

You look like something else. When imposed upon you by another, this is usually combined with a Confuse mechanic, but not necessarily -- several items and effects in the game will transform you, but the only confusion they cause is in the minds of onlookers.

Causes you to run in horror for short time. So far, Warlocks Death Coil is only ability that can inflict Horror-type debuff. Horror is very similar to Fear, but counter-fear items nor abilities cant break Death Coil.

(Note: Some sources say that this is un-removeable, but it's not confirmed.)